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as for the hoses try to replace as much as possible vacuum and crank case ventilation hoses.
now im in the process to see if 01 or 02 330 maf will help if anything. The 03 and newer have a different plug,so thats a dead end.

If you go with the 330 MAF then you need the 330 air box w/ a 3in opening, then 3in intake tubes, which would lead to ur smaller 2.5in TB... I dont think it would work...

I bought a B30 manifold including ALL parts (except TB) last month and it has been giving me headaches on how to install it, and I just ordered the TMS adapter plate as my mechanic says he won't make one and install the manifold for me after all (he's a VW/Audi geek and has no nerve to bother with BMW's )

Anyway, I was reading through the Bently manual and it says I have to keep pressure on the fuel lines and rail. Now I was about to DIY this project, but this part (and grinding the TB) gave me a bit of a shock and I am currently looking for a competent mechanic over here who could help me out with this.

The B30 manifold I bought also came with the fuel rail and the larger injectors. Is it recommendable to use both for the install?

I bought a B30 manifold including ALL parts (except TB) last month and it has been giving me headaches on how to install it, and I just ordered the TMS adapter plate as my mechanic says he won't make one and install the manifold for me after all (he's a VW/Audi geek and has no nerve to bother with BMW's )

Anyway, I was reading through the Bently manual and it says I have to keep pressure on the fuel lines and rail. Now I was about to DIY this project, but this part (and grinding the TB) gave me a bit of a shock and I am currently looking for a competent mechanic over here who could help me out with this.

The B30 manifold I bought also came with the fuel rail and the larger injectors. Is it recommendable to use both for the install?

And what exactly is the DISA valve?

Here is a picture of the manifold:

No, use your standard rail and injectors. The DISA is the big box that covers that gaping hole in the manifold, and switches the manifold from the low end runners, to the high end (it the hole above the TB opening) You'll need a B30 valve.

No, use your standard rail and injectors. The DISA is the big box that covers that gaping hole in the manifold, and switches the manifold from the low end runners, to the high end (it the hole above the TB opening) You'll need a B30 valve.

Just to further elaborate on Iceman00's explanation of the DISA valve, its a flap designed to change the length of the intake manifold runners. its actually a really fascinating concept and BMW did some serious R&D on this.

with engines, there are usually two routes you can go with intake runner lengths: shorter for better low end power or longer for better high end power. well, BMW came up with a way to put two lengths into one intake manifold and have a flap change the runner length, thus optimizing power across the entire power band. the DISA valve is the piece that changes the length of the runners. during low engine speeds it stays closed but about half way through the RPM band (i dont remember where) the flap opens up changing the length. but in order for BMW to make an intake manifold with dual length runners fit in that sardine can of an engine bay, they had to get creative. thats why our intake manifolds have more tubes than an oil refinery. especially compared to the old M50 intake manifolds you can see the differences made to capitalize on the DISA valve. all things considered though, i think BMW did a great job. the space where they "added" intake runner tubing was basically unused space.

now, just for the sake of saying it, its totally possible to put another intake manifold on these cars that uses no DISA valve (say an M50 intake manifold). i have absolutely no idea how well it would run but i would imagine it would improve power in the top end and you'd definitely lose power in the low end. in fact, while doing research for this swap i found tv show posted on youtube where a guy had an M50 intake manifold put on his supercharged M54 engine to get more power. apparently they are a lot better for supercharged applications on our cars than the manifolds that incorporate the DISA valves. but i dont remember where i saw the video so if someone is interested say so and i'll try and find it again.

here are some pictures. the DISA valve isnt labeled but its the red line in the middle of the diagram next to the "magnetic valve" and "vacuum unit" (which are all components of the DISA valve)